KR19990073881A - Non-MP data display method - Google Patents

Abstract

The present invention relates to a non-MP data display method for easily displaying a BMP file of a desired size at a desired position by using a VDP IC. The present invention relates to a display of Y in the data registers D0-D5, respectively. Insert coordinate value and X coordinate value, put (Y size-1) and (X size × 2-4) values of BMP image into D2 and D3 respectively, put color code to mask on D4, and then color calculation function on D5. Specifying an attribute code for determining the display start direction.When the instruction is completed, input the OP_CODE of the instruction in D6, put the start address of the BMP data in the address register A0, put the value of D3 + 4 in D3, and put it back in D3. After inputting the value of D3 ÷ 2, assign D3 to D4.If drawing FIFO access is available, transfer the data of the address indicated by A0 to CMD that can control the graphic IC from the CPU and increase the address by 2. Assigning the value of D3 to D3 after determining whether D3 is equal to -1, if D3 is -1, insert D4 into D3, and subtract 1 from D2 into D2, and if D2 = -1 This is done by performing the steps to end in sequence.

Description

Non-MP data display method

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for displaying a screen using LCD (Liquid Crystal Display) in car audio, and more particularly, to easily display a non-MPP (hereinafter referred to as BMP) file having a desired size at a desired position using a VDP IC. A method of displaying BMP data is provided.

In general, the screen display function that displays the current status of the device to the user, such as car audio, photocopier, mobile phone or telephone of the vehicle is widely used, and LCD as a means to perform the display function Is mainly used.

In the conventional OSD (On Screen Display), the font size is fixed to 12 x 18, and the font is edited using a designated OSD font editor.

However, there is a drawback that a conventional OSD cannot display a BMP file.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned shortcomings, and accesses the VDP IC from the CPU, reads BMP data contained in the ROM, and executes a WTCV (drawing instruction command) supported by the VDP IC in a desired size. The present invention provides a method for displaying BMP data that can display a BMP file.

1 is a block diagram of a non-MP data display device of the present invention;

2 is a flowchart illustrating a non-MP data display method according to the present invention.

<Explanation of symbols for main parts of drawing>

1: Main Microcomputer 2: CPU

3: DUART 4: PLD

5: VDP IC 6: first storage

7: Second storage 8: Third storage

9: display

The present invention for achieving the above object is configured to display the BMP file by accessing the VDP IC from the CPU to read the font data contained in the ROM and executing the fonts supported by the VDP IC. It is characterized by.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a hardware character display apparatus for carrying out the present invention, which is a dual asynchronous receiver / transmitter for controlling input and output between a main microcomputer 1 and a CPU 2 and a control unit. ROM CS, RAM CS, VDP CS, DUART CS signals that receive the 16-bit CPU 2, which is a control unit, and the address of the CPU 2, VPA, AS, R / * W, FC0-FC2, LDS, and UDS. A PLD (4) for outputting a signal, a VDP IC (5) which is a graphic element for outputting an RGB color signal under the control of the CPU (2), and performs video display processing, and stores data in connection with the CPU (2). A first storage unit 6 of a plurality of SRAMs, a second storage unit 7 of a plurality of ROMs connected to the CPU 2 to store data, and the VDP. A third storage section 8 made of a VRAM for storing and processing data of the graphic screen and the video screen of the IC 5 and outputted from the VDP IC 5; And a display unit 9, which is a 5.8 &quot; wide LCD for receiving a R.G.B signal and a composite video signal to display a graphic screen and a video screen.

Looking at the hardware operation of the present invention configured as described above, the DUART (3) stores the data received through the RC232C communication with the main microcomputer (1) in the internal receive data buffer.

Then, the CPU 2 reads the communication data from the received data buffer of the DUART 3 and stores it in the first storage unit 6, which is an SRAM.

The CPU 2 analyzes the data stored in the first storage unit 6 and reads BMP data corresponding to the analyzed data from the second storage unit 7 which is an OTP ROM.

In addition, the CPU 2 stores the BMP data read from the second storage unit 7 in the third storage unit 8 via the PLD 4 and the VDP IC 5.

The BMP data stored in the VDP IC 5 is converted into an R.G.B signal and displayed on the display unit 9.

Hereinafter, a process of displaying a BMP file using the VDP IC in the present invention will be described with reference to FIG. 2.

That is, in the data registers D0-D5, the Y coordinate value (0-1023) to be displayed is put in D0, and the X coordinate value (0-4095) to be displayed is put in D1.

In D2, the (Y size-1) value of the BMP image is put, and in D3, the (X size x 2-4) value of the BMP image is put.

Next, in D4, a color code (0-255) to be masked is put, and in D5, an attribute code for color calculation function and display start direction determination is specified.

In this way, it is determined whether the instruction is finished in the state of inserting data into the data registers D0-D5. If the instruction is finished, the OP_CODE of the instruction is input to D6.

The start address of the BMP data is put in the address register A0, D3 + 4 is put in D3, and then D3 ÷ 2 is put in D4.

Then, it is determined whether drawing FIFO access is possible, and if possible, transfers the data of the address indicated by A0 to CMD, an input / output (I / O) port where the CPU () can control the graphics IC, and increases the address by 2. The value reduced by 1 from D3 is then referred to as D3.

Next, it is determined whether D3 = -1, and if D3 is -1, D4 is put into D3, and then the value obtained by subtracting 1 from D2 is put into D2.

Next, it is determined whether D2 = -1, and if it is not D2 = -1, the state returns to the state where the drawing FIFO access is possible, and if D2 = -1, it ends.

Here, the BMP file is made with a graphic editor, and the number of horizontal and vertical pixels must be known in advance, and the BMP file can be displayed by executing the WTCV (drawing command).

As described above, the present invention is a device for displaying a current state using an LCD in a car audio or a copy machine or a mobile phone. In the related art, the BMP file cannot be displayed in the OSD. By reading the BMP data contained in the ROM and executing the WTCV supported by the VDP IC, the BMP file of the desired size can be easily displayed at the desired position.

Claims (1)

A first step of inserting the Y coordinate value and the X coordinate value to be displayed in D0 and D1, respectively, of the data registers D0-D5; Insert (Y size-1) and (X size × 2-4) values of BMP images into D2 and D3, respectively, and insert the color code to be masked into D4, and then set the color calculation function and display start direction in D5. The second step of specifying the code, When the instruction is completed, input the OP_CODE of the instruction to D6, put the start address of BMP data into the address register A0, put the value of D3 + 4 into D3, put the value of D3 ÷ 2 into D3, and then put D3 into D4. Steps, When drawing FIFO access is enabled, transfer the data of the address pointed to by A0 to the CMD that can control the graphic IC from the CPU, increase the address by 2, and assign the value 1 decreased from D3 to D3. , If D3 = -1, and if D3 is -1, the non-MP data display comprises a fifth step of inserting D4 into D3, subtracting 1 from D2 into D2, and ending if D2 = -1. Way.